The effect of emotional state on the learning of visual skills - Mills, Caroline; Coetzee, Nicoleen; Nortje, Evangeline; Kleynhans, Michael; FerreiraRonl; Fraser, William; Du Toit, Peet (Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / South African Journal of Science and Technology, 2014)